This the government's plan for a mass deployment of up to 5,000 armed troops in the event of a major terror attack.

May explained: "This means that armed police officers responsible for duties such as guarding key sites will be replaced by members of the armed forces, which will allow the police to significantly increase the number of armed officers on patrol in key locations.

"You might also see military personnel deployed at certain events such as concerts and sports matches, helping the police to keep the public safe."

(Image: Julian Hamilton/Daily Mirror)

It's already emerged this Saturday's Scottish Cup Final will see increased security.

But this morning, commuters took to social media to show their surprise at seeing armed officers at Scotland's busiest train stations.

Police officers were seen with guns at Glasgow Central, Queen Street and Edinburgh's Haymarket Stations.

Martyn Ritchie tweeted: “Turns out they're not f****g about with the terror threat level - armed police in Glasgow central station, first time I've ever seen that.”

Amanda Hall wrote: “Never in a million years did I expect to see armed police walking through Glasgow central! That definitely woke me up! #alltooreal #scary"

Gail Boag tweeted: “Armed Police at Queen st station this morning. What a world we now live in #Glasgow #Manchester".

Angie police tweet

Most were happy to see them, saying it made them feel safer.

Rosie McLuckie wrote; “Just seen armed police in Glasgow ok scary but good to know they're on it.”

"Police Scotland have already visibly increased their presence in locations such as transport hubs and city centres as a precaution

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"Security arrangements for upcoming public events, including this weekend's Scottish Cup Final, are being thoroughly reviewed and the public should anticipate additional safety measures such as full body and bag searches.

"Our emergency services prepare extensively for situations such as this, and those well-rehearsed plans are now being put into practice."